When I set an alarm, my clock, now running on the computer in my
pocket, is smart enough to tell me how much time will pass until
the alarm is scheduled to sound. This has eliminated the old problem
of sleeping past meetings before being surprised by an alarm precisely
half a day after I had originally planned to wake.

The price has been having to know exactly how little I will sleep: a
usually depressing fact that had previously been obscured by my
difficulty doing time arithmetic in my most somnolent moments.